STW Capillary Tube Thermostat5 A, Fail-safe

Sertifikaadid

  PTB 01 ATEX 1114
  NEPSI GYJ11.1611
 GOST R POCC DE.ME92.B02734
 GOSPROMNADZOR 11-02-0015-2012

Ex kaitse liik

 II 2G Ex ed IIC T6

Ümbritseva keskkonna temperatuur

-20 °C bis +50 °C
see datasheet

Kirjeldus

The 5 A capillary tube thermostat, STW, is a compact change-over controller housed in an EEx e certified polyester enclosure.

Heaters, fans, motors and other equipment are energised and de-energised by means of this thermostat when specific temperature ranges are exceeded. This device can also be used to control the temperature in air or on various surfaces.

Function

Any change in temperature at the sensor bulb causes a change in the volume of fluid in the measuring system, which in turn results in a movement of the diaphragm membrane. This membrane is connected to a mechanical device that activates a microswitch. If the temperature at the sensor bulb exceeds the pre-set value, terminals 1 and 4 are opened. If there is a rupture or break in the sensor tube (leakage), then the switch remains permanently open (fail-safe).

If the temperature falls below the minimum setting, the autocontrol opens the circuit but closes again on temperature rise.